PolyFlags
In the properties of a Brush, under Brush → PolyFlags you can give all surfaces of the brush default properties that override the Surface Flags (UT) in the Surface Properties window.
In PolyFlags you have to enter a number, what follows is a list of the meaning of all the numbers.
To give a brush two or more properties at the same time, you need to make the sum of the numbers of both properties. For example if you want a Translucent + TwoSided brush, you have to use the number 4 + 256 = 260.
After you entered the number you need to rebuild to see the change.
Here's the list. Flags with no effect are left out:
| Flag | Name | Description |
| 0 | Default | Use settings from Surface Properties for each individual surface of the brush. |
| 1 | Invisible | All surfaces of the brush are invisible |
| 2 | Masked | Use for palettized textures to make the first color in the palette (in Paint Shop Pro at least) invisible, see Color Blending |
| 4 | Translucent | Darker parts of the texture become transparent, see Color Blending |
| 16 | Force View Zone | |
| 64 | Modulated | Greyer parts of the texture become transparent, see Color Blending |
| 128 | Fake Backdrop | Parallax SkyBox visible through surface |
| 256 | Two Sided | Surfaces display their texture from both sides |
| 512 | U-Pan | Texture moves in U direction, change speed in ZoneInfo or LevelInfo → ZoneLight |
| 1024 | V-Pan | Texture moves in V direction, change speed in ZoneInfo or LevelInfo → ZoneLight |
| 2048 | No Smooth | Square pixels |
| 4096 | Special Poly | Doesn't do a lot |
| 8192 | Small Wavy | |
| 32768 | Low Shadow Detail | Reduces shadow detail; in conjunction with High Shadow Detail (below), makes extra low shadow detail |
| 262144 | Dirty Shadows | |
| 524288 | Bright Corners | No dark shadows at the edges of the surface |
| 1048576 | Special Lit | Surface only gets light from Special Lit lights |
| 2097152 | No Bounds Reject | |
| 4194304 | Unlit | Surface ignores lighting and is fullbright |
| 8388608 | High Shadow Detail | Enhances shadow detail |
